Of course those may all work if you set the mapping that way, but I tried those combinations and only the standard Ctrl + \ one worked on my game. This was tested right after resetting my keymappings to default. Maybe those are for alternate or non-English keyboards?

It sucks if you accidentally map over something like Alt + F10 (light) or Alt + Lclick (select item), because there is still no option to fix those in the keymap list. The only way I see to get them back is to reset everything.